Just a couple questions, do you mean single pilot with a remote operator on the ground? If so, as a former drone driver do you think it's feasible to have one remote operator monitoring 5-10 flights at once? You'd have to do that to gain any real savings. If you have a one to one, remote operator to flight ratio, the remote operator might as well be in the plane.
I ask because part 25 airplanes are built with multiple redundancies for all critical systems. Why bother removing that redundancy in the cockpit? Just to save a few bucks? Maybe a purpose built single pilot airliner would save some weight not having dual controls, a second seat etc. How much of that weight saving would be eaten up by the added remote pilot/monitoring systems? I'm just not sure the juice is worth the squeeze. It might be over a huge fleet of purpose built single pilot airplanes, but not a retrofit of existing two pilot airliners. Not flaming at all, just curious of your opinion.
The added weight to the aircraft could be measured in tens of pounds. It would take three shoe-box sized components to control the aircraft, everything else already exists on most passenger jets. The heaviest part of the system would be Satcom gear and that would pretty much be a wash once you took out the pilot, his O2, his seat, baggage and never slimming backside.
What happened to the FE/FO? The same thing that will happen to the FO/Dispatcher, their duties will be combined.
The first thing that will happen is you will see a highly structured change to flight schedules. With unmanned aircraft you will be able to build departures, enroute, and arrivals, think RVSM to the extreme. The aircraft will be programed to auto-sequence to maintain X miles in trail, Z horizontal, and Y vertical separation. Weather deviations will be handled by the "pilot monitoring" along additional pre-planned routes. In the event of an aircraft needing "15 right for buildups" the pilot on board will request it and the "FO" monitoring on the ground will adjust the trailing flight plans as required with just a click and drag of the mouse. When this starts to happen I'll drop my childish resistance to the word "drone" since the planes will behave as if they were worker bees chasing after pollen.
I see the limiting factor right now as economic, not functional. Satellite bandwidth is stupid expensive right now, to the tune of $75k per month for enough baud for three aircraft. As space becomes more privatized that cost will drop like a greased safe. Once BLOS technologies become economically feasible the push will begin, all in the name of safety and golden parachutes.
The pilot on board will retain PIC authority with the main command and control will come from the ground but he will always be able to override. Because there is a pilot monitoring on board the system, and the FAA, will allow for the ground based crew to monitor multiple aircraft at once much like a dispatch office does today. No one bats at a flight follower looking at multiple aircraft on a plasma screen today, I don't foresee that changing at all. The only difference will be they have access to the aircraft's chocolate bar and all functions required to fly it.
In the event of an IFE both sides will utilize CRM and a specific training program that allows both sides to work together to accomplish a common goal; the safe outcome of the flight.
For example, if a school bus full of nuns runs into the GDT then both the pilot on board and crew on the ground will follow a script to re-establish communication. Once communication is re-established the flight will continue as normal. If communication is not re-established then there are two possible outcomes. First, and most likely, the pilot on board will complete the flight as a conventional flight. If some how the pilot on board were to become incapacitated AND comms were lost I can assure you that the plane can still make it's intended point of landing and hit it's touch down spot within 1.5 meters. One of my UAVs had three autonomous lost comm landing procedures and none of those were anything other than mind blowing. They hit the touch down point every time with out fail, only two of those modes require GPS. Hell, if you could establish the proper comms with the aircraft a teenager with a futaba could land the plane. No, I'm not joking, that was backup number four.
Each airport of intended landing will have launch and recovery teams that have, and use, full functionality to fly the aircraft through all phases of flight. Once they're done with it they hand it off to another site using either LOS comms or Satcom. Even the "slow" Satcoms are down to 2 second lags for control inputs.
For other IFE's the plane can be programmed to do everything without anyone having to take any action. Aileron fail? Ok, one of two central computers automatically "fails" the opposite aileron to the same angle so that asymmetric lift conditions don't develop. Spoilerons and the other set of ailerons take over. If two sets fail then the flaps become ailerons.
If you subscribe to the "two is one, one is none" way of thinking you'll like UAVs. The larger and more capable aircraft have backups for their backups for their backups. Preds, Reapers, and Global Hawks don't just fall out of the sky. Most often when they crash it's because of pilot error, just like manned aircraft.
Five years ago the ATOL technologies were fantastically, the equipment was reliable, and the race to the bottom hadn't started for operators. At this point only one of those has changed.